Which of the following statements concerning cryptochrome is FALSE?
a. It is implicated in resetting the biological clock.
b. It is a "clock protein."
c. It absorbs green light.
d. Its counterparts are found in fruit flies and mice.
e. It sometimes interacts with phytochrome.
C
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Stem cells that can differentiate into any type of tissue but cannot differentiate into a complete organism are ______________ cells
A. totipotent B. pluripotent C. unipotent D. None of the choices is correct.
Hemophilia is caused by an X-linked recessive mutation in humans. If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability that their first child will have hemophilia? (Assume that no other cases of hemophilia and no hidden carriers exist in the pedigree.)
A) 0 B) 1/4 C) 1/2 D) 1/8 E) 1
Monoclonal antibodies:a
have been linked as causative agents in some types of cancer. b. are only produced by harvesting B cells from mice exposed to particular antigens. c. include hCG, a component of commonly used home pregnancy tests. d. are very specific for their target antigen, but are somewhat difficult to purify. e. are produced by millions of genes.
What is the free-running nature of circadian rhythm analogous to?
a. a desktop computer b. a digital telephone c. an old-fashioned wrist watch d. a modern calculator